How to Change the Coolant in a 2010 Yamaha YZ85
Shop parts for a 2010 Yamaha YZ85 Dirt Bike.
Regularly changing the coolant in your 2010 Yamaha YZ85 is essential for optimal engine temperature and maximum performance on the track or trail. The YZ85, renowned for its high-revving two-stroke engine, demands consistent maintenance to keep cooling efficiency at peak levels. Use this step-by-step guide to safely replace the coolant and ensure your bike–s cooling system is in top condition.
What You Need
- Fresh motorcycle coolant (avoid premixed or automotive coolants that may harm seals)
- Funnel
- Drain pan
- Rags
- Socket set (to remove drain bolt and radiator cap)
- Service manual or torque chart (for proper drain bolt torque)
- Optional: new crush washer for the drain bolt
Step-by-Step Coolant Change for the YZ85
- Ensure engine is cool. Never open the radiator cap on a hot engine. Place your YZ85 upright on a stand.
- Remove the radiator cap. Slowly unscrew the radiator cap to release any pressure.
- Position the drain pan. Place a pan beneath the water pump drain bolt–usually found on the lower right side of the engine.
- Remove the drain bolt. Use a socket to remove the drain bolt. Allow coolant to fully drain. For a more thorough flush, tilt the bike gently side to side. This model typically uses a simple drain bolt–no need to remove functional hoses unless you are servicing hoses or radiators.
- Flush if needed. If the coolant is dirty or you are switching coolant types, flush the system with clean distilled water. Replace the drain bolt and allow water to drain completely.
- Inspect and reinstall drain bolt. Clean the bolt, inspect or replace the crush washer, and re-install. Tighten to factory spec–do not overtighten to avoid stripping the case.
- Fill with coolant. Using a funnel, slowly pour fresh coolant into the radiator until it reaches the base of the filler neck. Tap or rock the bike lightly to release any air bubbles.
- Start and bleed the system. With the radiator cap off, briefly run the engine (15-30 seconds) to circulate coolant and dislodge trapped air. Check coolant level and top off if needed.
- Reinstall radiator cap. Ensure it is fully seated. Clean any spillage off the engine and frame.
- Check for leaks. Start engine and let it reach operating temp. Inspect all seals and the drain bolt area for leaks.
YZ85-Specific Tips & Notes
- 2010 YZ85 uses a relatively small coolant volume, usually less than 1 liter, making it crucial to not overfill.
- Stay away from pure water or automotive antifreeze not intended for motorcycles since these can reduce cooling efficiency or harm seals.
- Check the radiator cap and hoses for age-related cracks or wear during every coolant change and replace as needed to avoid overheating.
- If racing or riding in extreme heat, consider a high-performance or race-specific coolant for improved boil-over protection.
When to Replace Coolant
- At least once a year, or more often if riding in muddy, hot, or dusty conditions
- If the coolant appears discolored or debris-filled
- After any major overheating event
Regular coolant changes are a simple way to keep your 2010 YZ85 running cool, strong, and reliable for every ride. For all your replacement and performance parts, Shop parts for a 2010 Yamaha YZ85 Dirt Bike.
Related Shopping Categories
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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.